Shipping and display carton and blank therefor

ABSTRACT

An improved folding paper-board carton formed of a unitary blank having longitudinal and transverse fold facilitating score lines whereby the blank is adapted to be formed into a carton, said blank including longitudinal and transverse tear facilitating score lines for the removal of a tear panel whereby the carton is readily convertible from a sturdy shipping container to a display and dispensing enclosure of increased efficiency and attractiveness.

Unite States Patent I 1 332,96 Spiegel Aug. 13, 1974 [54] SHIPPING ANDDISPLAY CARTON AND 3,620,438 11/1971 Wood 229/51 D X BLANK THEREFORFOREIGN PATENTS OR APPLICATIONS [76] Inventor: Richard G. Spiegel, 4925W. v 1,009,558 5/1957 Germany 229/5'1 TC Coventry, Hopkins, Minn.Primary Examiner-Donald F. Norton [221 Ffled' 1973 Attorney, Agent, orFirm-Arthur S. Caine [21] App]. N0.: 328,840

[57] ABSTRACT 52 us. (:1. 229/51 TS, 229/51 WB An improved folding P pCarton formed of a [51] int. Cl 865d 5/54 unitary blank havinglongitudinal and transverse fold 5 Field f Search 229 7 R, 7 R, 5 R, 5 5facilitating score lines whereby the blank is adapted to 229/51 1) 51 351 20 44 R be formed into a carton, said blank including longitudinaland transverse tear facilitating score lines for the 5 References Citedremoval of a tear panel whereby the carton is readily UNITED STATESPATENTS convertible from a sturdy shipping container to a dis- 2 1 15673 4/1938 stompe 229/51 TS X play and dispensing enclosure of increasedefficiency 2:953:293 9/1960 Anderson :IIIZIIIIIIIIH.. 229/51 T5 andattractweness' 3,113,713 12/1963 Green 229/51 WB 12 Claims, 7 DrawingFigures PATENTED AUG 1 31974 SHEET 2 [IF 3 PATENTED M1131 31974 3. B29.006

sum 3 or 3 FIG, 6 o

LIFT TO OPEN SHIPPING AND DISPLAY CARTON AND BLANK THEREFOR This is acontinuation-in-part application of Richard G. Spiegel, Ser. No. 114,980filed 02/12/71, and now abandoned.

THE INVENTION This invention relates to the field of shipping anddisplay containers, and more specifically to knock-down, set-up cartonsformed from a one-piece blank, particularly designed to be folded into asafe container which is sufficiently sturdy for shipping purposes duringwhich the carton may be stacked one upon the other, and atthe same timeis especially well adapted for quick easy conversion to an inexpensivearticle display and article dispensing enclosure for use with articleswhich are of comparatively limited horizontal space area, or slenderarticles having a relatively high center of gravity, which articlesmight easily topple from the container if not suitably confined.

Containers used for shipping articles, particularly when plural articlesare to be enclosed in a single container, are preferablyparallelepipedic in conformation to facilitate stacking the containersin transport vehicles. After reaching their destination, such as aretail establishment, it is often very desirable that the same containerbe usable to display the articles in attractive fashion, often in a massdisplay. Frequently it is the practice that free standing stacks of suchcontainers are made available so that customers may serve themselves,and the container then also serves a dispensing function as well. Thismultiple use of cartons is not broadly new.

My invention constitutes an improvement in multipurpose cartons for usewith articles which are relatively tall compared with their base area,and which for attractive presentation or for other reasons must bedisplayed to potential customers in an upright position. This means thatthe display area must be tall, and also that the container must be soconfigured that even when converted to display use, it will resist thetendency of the articles displayed to topple from the container, whileat the same time presenting them for maximum visual inspection and foreasy removal.

Another controlling factor in the design of an efficient container thatserves for both shipping and display purposes, which is also adapted formachine packing, which of course includes machine assembly of the cartonitself. For this purpose it is desirable that the carton be formed of asingle blank, and which, when opened for display purposes reveals cleannon-ragged edges.

It is accordingly a principal object of the present invention to providea new and improved one piece carton blank, and more especially toprovide such a blank which can be readily formed into a rugged shippingcontainer, and subsequently converted with ease into an efficient,attractive display enclosure for plural articles of relatively unstableequilibrium.

Another object of the invention is to provide a safe and relativelyinexpensive shipping carton formed with an integral tear portion thatcan be easily removed and which is centered approximately in an areacomprised of top and front body panels of the carton.

Another object is to provide a safe and relatively inexpensive shippingcontainer formed with an integral tear portion that can be easilyremoved, leaving a clean and undisfigured edge and surface to theremainder of the container.

Various other objects, advantages, and features of novelty whichcharacterize my invention are pointed out with particularity in theclaims annexed hereto and forming a part hereof. However, for a betterunderstanding of the invention, its advantages, and objects attained byits use, reference should be had to the drawing which forms a furtherpart hereof, and to the accompanying descriptive matter, in which thereis illustrated and described a preferred embodiment of the invention.

In the drawing:

FIG. 1 shows the carton blank of one embodiment in its unformed orundeveloped state;

FIGS. 2 and 3 show the blank formed into a shipping container;

FIG. 4 shows the shipping container converted to a display enclosure forarticles within it;

FIG. 5 is a magnified section of the material or board forming thecarton taken on the lines 55 of FIG. 1;

FIG. 6 shows the blank in a modified form in its unformed or undevelopedphase; and

FIG. 7 shows the second blank of the modification formed into a shippingcontainer.

As shown in FIG. 1, my invention comprises a carton blank generallyidentified by the reference number 10,

and preferably made of double faced corrugated fiber board. The blank issymmetrical about a longitudinal axis identified by the broken line11-11, which may advantageously extend perpendicular to the grain of thematerial. The blank has first and second longitudinal fold-facilitatingscore lines 12 and 13 and a plurality of transverse fold-facilitatingscore lines 14, 15, 16 and 17, by which it is divided into a back bodypanel 20 having transversely extending end tabs 21 and 22, a bottom bodypanel 23 having transversely extending tabs 24 and 25, a front bodypanel 26 having transversely extending end tabs 27 and 28, a top bodypanel 29 having transversely extending end tabs 30 and 31, and a closuretab 32. At the opposite end of the blank there is a printed surface 33which receives adhesive material and forms a separate layer between theadhesive and the adjacent surface of the fiber board, as will bediscussed hereinafter.

A tear panel 35 extending longitudinally across the whole of panel 29and most of panel 26, and symmetrical about axis l111, is defined by atear-facilitating score line generally identified by the referencenumeral 36. The transverse extent of panel 35 is somewhat less than thatof panels 29 and 26, so that it defines marginal portions 37 and 38 intop panel 29, and marginal portions 39 and 40 in front panel 26.

For reasons presently to be explained, line 36 is not everywhere thesame along its length, but consists of completely cut portions indicatedby solid lines, perforated portions, indicated by lines with simplecross markings, and special portions combining perforations withsuperimposed cuts through half the thickness of the material, indicatedby lines with double cross portions. By a perforated portion is meant aseries of cuts or punchings closely spaced along the desired line andpassing all the way through the material.

Line 36 will now be traced in detail. It begins with a completely outportion 41 at one end of fold facilitating line 17 between top panel 29and the closure tab 32, then includes as partially seen in FIG. 5, ashort perforated portion 42, a special portion 43, another perforatedportion 44, a cut portion 45 crossing the fold facilitating line 16, anda perforated portion 46, all extending in a direction generally parallelto axis 1111, to a completely out corner 47. From corner 47, line 36extends transversely of axis 11-11 as a perforated portion 48, acompletely cut central portion 49 and a perforated portion 50 to asecond completely cut corner 51, and thence parallel to axis l1-11 as aperforated portion 52, a completely out portion 53 across line 16, aperforated portion 54, a special portion 55, and a perforated portion 56to line 17, terminating as a completely cut portion 57 along line 17 toits end. Associated with completely cut portion 49 of line 36 are threefurther complete cuts 58, 59 and 60.

The blank just described may be produced in quantity by a suitablyconstructed die having cutting, creasing, perforating, and special rulessuitably located and used in a suitable press. One such die has a baseof 5/8 inch hard core maple plywood. The cutting rule is 0.937 inchbeveled steel with 5/16 inch l/2 inch hard rubber glued to each side.The creasing rule for the fold-facilitating lines is a 0.900 inch steelrule. The perforating rule is 0.937 inch beveled steel rule, and thespecial rule is also 0.937 inch beveled steel rule, bevel ground to0.918 inch every other 1/8 inch. Cutting is done from the inside of theblank. The material used was single walled corrugated fiber board (alsoknown as double faced) i.e., one flat facing is glued to each side ofthe corrugated member. The material had a bursting strength of 200pounds.

As shown on a magnified scale in FIG. 5, the board is composed of theflat outer faces 10a and 100 glued to the opposite sides of thecorrugated center portion 10b. This figure shows the three differentcharacteristics of the tear line 36. At the right of the figure, thecompletely cut portion 41 is shown, which obviously offers noresistance. The special portion 43 is shown at the left of the figure;here the lower face 100 of the board is completely cut and the cutextends partially through the center portion 10b, while the upper face10a has spaced perforations giving some strength to that part of thetear line. The portion 42 at the right of the figure between portions 43and 41 has perforations between which are interconnected portions of thethree parts of the board which will give greater strength to that partof the tear line 36.

In use a blank 10 is placed in a suitable packaging machine, and thedesignated quantity of articles (here shown as tall cylinders 61) isdeposited on bottom portion 23, as suggested by the dotted circles 62 inFIG. 1. The blank is folded along lines 14, 15, 16 and 17, to encirclethe articles and closure tab 32 is secured to the printed surface 33located at the upper edge of back panel 20 with a quick-settingadhesive. Tabs 21, 22, 27 and 28 are folded inwardly against thearticles, and tabs 24, 25, 30 and 31 are then folded against tabs 21,22, 27, and 28, and secured with the same adhesive. After the adhesivehas set, the container and contents bear the appearance of the structureshown in FIG. 2, and is ready for storage or shipment.

When it is desired to display the articles in the carton, the retailerpresses his fingers against the front panel 26, just above the cutportion 49, depressing the material forming the tabs defined by cuts58460, and inserts his fingers under the center of the tear panel 35. Asteady outward and then upward pull on the tear strip separates thestrip on either side of the cuts 58-60 along the portions 48, 50 andthence 46, 52 to the fold line 16 and thence through the perforatedportions 44,

54. As the action continues, the length of the tear strip increases andthe tendency to roughly tear the outer layer of the fiber board wouldincrease; however, at this point the special cut portions 43 and 55 ofthe score line come into play and the separation across the top panel 17is clean or precise to the fully cut portions 41 and 57. At this point,the lifting action is exerted wholly upon the closure tab 32 that isheld by adhesive to the printed portion 33 of the back body panel 20.Since the ink of the printed portion 33 is between the inner surface ofthe tab 32 and the outer surface of the back panel 20, the break orseparation occurs between these two surfaces, so that under the impetusof the lifting pull, the closure tab 32 will cleanly separate from theback panel 20, exposing the contents of the container 10 as seen in FIG.4. The provision of the marginal portions 37, 38, 39 and 40 addmaterially to the usefulness of the carton by providing a degree ofreinforcement to the lateral portions of the open carton. Moreover,these portions also act to prevent the contents of the carton, hereshown as tall cylindrical containers, such as aerosol hair spraycontainers, from toppling out of the carton.

One of the major requirements of a display carton is attractiveness andneatness. I have found that the use of complete cuts at corners 47 and51, at the points 45 and 53 where line 36 crosses line 16, and at 41 and57 where line 36 coincides with line 17, prevents the occurrence ofragged unsightly tears at these points, where they are otherwisespecially prevalent. It has also been observed that in the normalopening process, the direction of application of force is such thatwhile the simple perforation gives a clean separation along the frontbody portion 26, there is a tendency to raggedness along the top panel29; use of the special portions of line 36 at 43 and 55 gives animproved appearance to the top of the dispenser without unduly weakeningthe carton for shipping purposes.

A second embodiment of the knock-down set-up carton is illustrated inFIGS. 6 and 7. FIG. 6 shows the knock-down carton blank which isessentially spaced about a longitudinal center line 71 and thus issymmetrical about said center line. The blank has first and secondlongitudinal fold-facilitating score lines 72 and 73, and transversefold-facilitating score lines 74, 75, 76 and 77 by which it is dividedinto a back body panel 80 having transversely extending end tabs 81 and82, a bottom body panel 83 having transversely extending end tabs 84 and85, a front body panel 86 having transversely extending end tabs 87 and88, a top body panel 89 having transversely extending end tabs 90 and91, and a carton closure tab 92.

A tear panel is essentially centrally arranged within the adjoiningpanels 86, 89, and is also symmetrical about the center line 71. Thetear panel 95 is defined by an endless tear facilitating score linegenerally identified by the reference numeral 96. The transverse extentof tear panel 95 is somewhat less than that of body panels 86 and 89between score lines 72 and 73, so that the score line 96 and foldfacilitating lines 72, 73, define marginal portions 97, 98, in frontpanel 86 and marginal portions 99, 100 in top panel 89, Marits length,but consists of completely cut portions indicated by solid lines at thecorners of the rectangle and perforated portions between the corners. Bya perforated portion is meant a series of cuts or punchings closelyspaced along the desired score line and passing all the way through thematerial. A completely out portion consists of a continuous punchingwhich penetrates through the carton blank to assist in making a cleantear-away of the panel 95.

To assist in the desired removal of the tear panel 95, a circularpunch-out portion 107 defined by a circular perforating tearfacilitating line is provided. The punch-out portion 107 is adjacent themarginal area 104 between tear-facilitating line 96 in the top panel 89and adjacent to the transverse fold facilitating scoreline 77.

In use a carton blank 70 is placed in a suitable packaging machine, andthe designated quantity of articles (here shown as cylinders 61), whichmay be of any designated number, is deposited on the bottom body panelor second panel 83, as represented by the dotted circles 106.

The blank is folded along score lines 74, 75, 76 and 77 to encircle thearticles 61. Thereafter, carton closure tab 92 is secured to the upperexterior of the back panel 80 with a quick-setting adhesive. Transverseend tabs 81, 87, are folded inwardly against the articles, and end tabs84 and 90 are then folded against the tabs 81, 87, and secured with thesame adhesive. Similarly transverse tabs 82 and 88 are folded againstthe standing articles 61, and then end tabs 85, 91 are folded againstthe tabs 82, 88, and also secured thereto with the same adhesive. Afterthe adhesive has set, the container and contents bear the appearance ofthe structure in FIG. 7, and is ready for storage or shipment.

When the retailer receives the articles in the carton and desires todisplay the articles in the carton, he presses fingers against thepunch-in tab 107, depressing the material forming the tab. Thereafter,he inserts his fingers in the hole of panel 89, resulting from theremoval of tab 107. A steady upward pull on the tear strip 95 separatesthe strip on either side from the margin portions 99, 100, 104 and theseparation action continues across the fold line 76. Thereafter anoutward and downward action is applied across the fold line 76 and panel86 to the horizontal bottom tear facilitating fold line shown in FIG. 7.

The transverse marginal portions 103, 104 of panels 86, 89, between thetear panel 95 and the transverse fold lines 75, 77, along with thelongitudinal margin portions 97, 98, 99 and 100 following removal ofpanel 95 serve to strengthen the end walls of the carton. One end wallof the carton comprises marginal end tabs 82, 85, 88 and 91. Byproviding the horizontal structural members 103, 104, which tie in withmargin members 98, 100, secured to end tabs 88, 91, an end is reinforcedand thereby opposes lateral movement, thereby tending to maintain theshape of the set-up cartons following removal of the tear panel fordisplay purposes.

Numerous objects and advantages of my invention have been set forth inthe foregoing description, to-

gether with details of the structure and function of the invention, andthe novelty thereof is pointed out in the appended claims. Thedisclosure, however, is illustrative only and changes may be made indetail, especially in matters of shape, size and arrangement of parts,within the principle of the invention, to the full extent indicated bythe broad general meaning of the terms in which the appended claims areexpressed.

I claim as my invention:

1. A carton blank symmetrically arranged on a longitudinal axis andhaving impressed thereon longitudinal and transverse-fold facilitatingscore lines parallel and perpendicular respectively to the center lineor longitudinal axis of the carton blank thereby defining in sequence afirst, back body panel, a second, bottom body panel, a third, front bodypanel, and a fourth, top body panel, all of said panels havingtransversely extending end flaps extending beyond the longitudinal foldfacilitating score lines, a closure tab, and a tear panel, defined by anendless tear-facilitating scoreline, said tear panel having a smallertransverse extent than the portions of said body panels within thelongitudinal fold facilitating score lines, said tear facilitating scoreline being symmetrical about said longitudinal axis and with an areaextending into said third and fourth panels from the fold-facilitatingline between the third and fourth panels.

2. A carton blank symmetrically arranged on a longitudinal axis orcenter line and having impressed therein longitudinal and transversefold-facilitating score lines parallel and perpendicular respectively tothe center line, said fold-facilitating score line defining in sequencea first, back body panel, a second, bottom body panel, a third, frontbody panel, and a fourth, top body panel, all of said panels havingtransversely extending end flaps, a closure tab, and a tear paneldefined by a tear-facilitating score line, the tear panel being smallerin transverse extent than the portions of said body panels between thelongitudinal fold facilitating score lines, said tear panel beingsymmetrical about said center line and with an area composed of adjacentportions of said third and fourth panels on opposite sides of the foldfacilitating score line between said third and fourth panels.

3. A carton blank symmetrically arranged on a longitudinal axis andhaving longitudinal and transverse fold-facilitating score linesdefining in sequence a first, back body panel, a second, bottom bodypanel, a third, from body panel, and a fourth, top body panel all havingtransversely extending end flaps, and a closure tab; and a tear panel,of smaller transverse extent than said body panels, symmetrical aboutsaid axis and extending across the entire fourth panel and a greaterportion of the third panel, said tear panel being defined by atearfacilitating score line extending, from the score line between saidclosure tab and said top panel, axially across said fourth panel, thescore line between said fourth and third panels, and the major portionof said third panel to a first comer, thence transversely across saidthird panel to a second corner, and thence axially across said thirdpanel, the score line between said third and fourth panels and saidfourth panel to the score line between said fourth panel and saidclosure tab.

4. The invention defined by claim 3, together with means in said tearpanel adjacent to said tearfacilitating score line and between saidcorners, for facilitating initiation of the tear.

5. The invention of claim 3, in which said tearfacilitating score lineis for the most part perforated, but is a continuous cut at each of saidcorners.

6. The invention of claim 3, in which said tearfacilitating score lineis for the most part perforated, but is continuous across theintersection thereof with the score line between said third and fourthbody panels.

7. The invention of claim 3, in which the score line between said fourthpanel and said closure tab includes completely cut end portionsextending towards said axis as far as said tear-facilitating score line.

8. The invention of claim 3, in which the portion of saidtear-facilitating score line extending across said fourth body panelcombines through-perforations with a continuous cut of a portion of thethickness of said blank.

9. In a carton having a front panel, a top panel, a-

ing neat removal of said closure tab with said tear panel.

10. The invention according to claim 9, in which said pair of furthertear-facilitating lines are less resistant to tearing across said toppanel than they are across said front panel.

11. A carton blank symmetrically arranged on opposite sides of alongitudinal axis or center line and having both longitudinal andtransverse fold-facilitating score lines which define in sequence afirst, back body panel; a second, bottom body panel; a third, front bodypanel; and a fourth, top body panel; all panels having transverselyextending end flaps; a closure tab; and a tear panel, defined by a tearfacilitating score line, with smaller transverse extent than that ofsaid body panels between the longitudinal fold facilitating score lines,and centered within said third and fourth body panels about said centerline, said tear panel being defined by a tear-facilitating score lineextending in part the width of the tear panel transversely in the fourthbody panel at a position short of the score facilitating line betweensaid closure tab and said fourth or top body panel, the tear panel beingfurther defined by a pair of longitudinal lines from the ends of thetransverse tear lines that extend in the direction of the center lineacross the remainder of said top body panel, then across the foldfacilitating score line between said fourth and third body panels andlongitudinally across the major portion of the third panel, and the endsof the longitudinally extending tear lines thence being connected by atear line transversely of said third panel.

12. The invention defined by claim 11, together with means in said tearpanel adjacent the transverse tearfacilitating line in said fourthpanel, for facilitating initiation of the tear.

1. A carton blank symmetrically arranged on a longitudinal axis andhaving impressed thereon longitudinal and transverse-fold facilitatingscore lines parallel and perpendicular respectively to the center lineor longitudinal axis of the carton blank thereby defining in sequence afirst, back body panel, a second, bottom body panel, a third, front bodypanel, and a fourth, top body panel, all of said panels havingtransversely extending end flaps extending beyond the longitudinal foldfacilitating score lines, a closure tab, and a tear panel, defined by anendless tear-facilitating scoreline, said tear panel having a smallertransverse extent than the portions of said body panels within thelongitudinal fold facilitating score lines, said tear facilitating scoreline being symmetrical about said longitudinal axis and with an areaextending into said third and fourth panels from the fold-facilitatingline between the third and fourth panels.
 2. A carton blanksymmetrically arranged on a longitudinal axis or center line and havingimpressed therein longitudinal and transverse fold-facilitating scorelines parallel and perpendicular respectively to the center line, saidfold-facilitating score line defining in sequence a first, back bodypanel, a second, bottom body panel, a third, front body panel, and afourth, top body paNel, all of said panels having transversely extendingend flaps, a closure tab, and a tear panel defined by atear-facilitating score line, the tear panel being smaller in transverseextent than the portions of said body panels between the longitudinalfold facilitating score lines, said tear panel being symmetrical aboutsaid center line and with an area composed of adjacent portions of saidthird and fourth panels on opposite sides of the fold facilitating scoreline between said third and fourth panels.
 3. A carton blanksymmetrically arranged on a longitudinal axis and having longitudinaland transverse fold-facilitating score lines defining in sequence afirst, back body panel, a second, bottom body panel, a third, front bodypanel, and a fourth, top body panel all having transversely extendingend flaps, and a closure tab; and a tear panel, of smaller transverseextent than said body panels, symmetrical about said axis and extendingacross the entire fourth panel and a greater portion of the third panel,said tear panel being defined by a tear-facilitating score lineextending, from the score line between said closure tab and said toppanel, axially across said fourth panel, the score line between saidfourth and third panels, and the major portion of said third panel to afirst corner, thence transversely across said third panel to a secondcorner, and thence axially across said third panel, the score linebetween said third and fourth panels and said fourth panel to the scoreline between said fourth panel and said closure tab.
 4. The inventiondefined by claim 3, together with means in said tear panel adjacent tosaid tear-facilitating score line and between said corners, forfacilitating initiation of the tear.
 5. The invention of claim 3, inwhich said tear-facilitating score line is for the most part perforated,but is a continuous cut at each of said corners.
 6. The invention ofclaim 3, in which said tear-facilitating score line is for the most partperforated, but is continuous across the intersection thereof with thescore line between said third and fourth body panels.
 7. The inventionof claim 3, in which the score line between said fourth panel and saidclosure tab includes completely cut end portions extending towards saidaxis as far as said tear-facilitating score line.
 8. The invention ofclaim 3, in which the portion of said tear-facilitating score lineextending across said fourth body panel combines through-perforationswith a continuous cut of a portion of the thickness of said blank.
 9. Ina carton having a front panel, a top panel, a back panel, and a closuretab for securing the back of the top panel to the top of said backpanel, a tear panel defined by a first tear-facilitating line extendinghorizontally across said front panel and a pair of furthertear-facilitating lines extending upward from the opposite ends of thefirst line to the upper limit of said front panel and thence across theentire top panel to its intersection with the back panel, and meanscoacting between said back panel and said closure tab for facilitatingneat removal of said closure tab with said tear panel.
 10. The inventionaccording to claim 9, in which said pair of further tear-facilitatinglines are less resistant to tearing across said top panel than they areacross said front panel.
 11. A carton blank symmetrically arranged onopposite sides of a longitudinal axis or center line and having bothlongitudinal and transverse fold-facilitating score lines which definein sequence a first, back body panel; a second, bottom body panel; athird, front body panel; and a fourth, top body panel; all panels havingtransversely extending end flaps; a closure tab; and a tear panel,defined by a tear facilitating score line, with smaller transverseextent than that of said body panels between the longitudinal foldfacilitating score lines, and centered within said third and fourth bodypanels about said center line, said tear panel being defined by aTear-facilitating score line extending in part the width of the tearpanel transversely in the fourth body panel at a position short of thescore facilitating line between said closure tab and said fourth or topbody panel, the tear panel being further defined by a pair oflongitudinal lines from the ends of the transverse tear lines thatextend in the direction of the center line across the remainder of saidtop body panel, then across the fold facilitating score line betweensaid fourth and third body panels and longitudinally across the majorportion of the third panel, and the ends of the longitudinally extendingtear lines thence being connected by a tear line transversely of saidthird panel.
 12. The invention defined by claim 11, together with meansin said tear panel adjacent the transverse tearfacilitating line in saidfourth panel, for facilitating initiation of the tear.